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Provision for Income Taxes, Classified by Timing and Location of Payment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Document Fiscal Year Focus 2018    
U.S. federal $ 292.9 $ 2,030.8 $ 1,046.6
U.S. state 183.9 169.8 121.3
Outside the U.S. 1,312.4 1,217.0 1,550.2
Current tax provision 1,789.2 3,417.6 2,718.1
U.S. federal 145.7 (120.1) (122.1)
U.S. state 18.7 12.8 14.1
Outside the U.S. (61.8) 70.9 (430.6)
Deferred tax provision 102.6 (36.4) (538.6)
Provision for income taxes $ 1,891.8 $ 3,381.2 $ 2,179.5